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FEATURES OF ALUMINUM POWDER PAP-2 GRANULATION IN THE TECHNOLOGY OF Al–Al2O3 POWDER COMPOSITE WITH LAYERED STRUCTURE

https://doi.org/10.17073/1997-308X-2017-4-37-43

Abstract

Modern scientific technical information implies great prospects for the use of Al–Al2O3 based composite materials (CM). The papers by the Materials Science Department of Moscow Aviation University have shown the reactive air sintering of highly-dispersed PAP-2 powder blanks to be a promising way of obtaining the aluminum-base CM. However, it is necessary to solve a number of technological problems to apply the above technique such as the lack of fluidity and extremely low apparent density. The paper studies and suggests various methods of PAP-2 aluminum powder granulation with their physical and chemical aspects described. Various technological approaches to PAP-2 aluminum powder granulation have been used based on such process operations as powder heating in air followed by isothermal aging at 350 °C, adding water solution of sodium-silica glass, mechanical processing of powder in high-energy planetary mill, its heat treatment in vacuum at 650 °C initiating the stearin saponification reaction on the surface of the PAP-2 flakes followed by the formation of the organic component – plasticizer. It is found that the proposed methods of industrial  PAP-2 powder granulation can modify its composition and structure as well as improve and vary technological characteristics of the original powder. The highest value of apparent density (up to 1,25 g/cm3) is achieved when using mechanical treatment of the original powder in a high-energy planetary mill with the formation of rounded granules 50–150 μm in size. The most producible and cost-effective technique is based on initiating the chemical reaction of «stearin saponification» on the surface of powder particles (with apparent density of approximately 0,4 g/cm3).

About the Authors

D. A. Ivanov
Moscow Aviation Institute (National Research University) – MAI
Russian Federation
Cand. Sci. (Tech.), associate prof., Department of materials science


S. D. Shlyapin
Moscow Aviation Institute (National Research University) – MAI
Russian Federation
Dr. Sci. (Tech.), prof., Department of materials science


G. E. Valyano
Joint Institute for High Temperatures of the RAS
Russian Federation
Senior researcher


L. V. Fedorova
Moscow Aviation Institute (National Research University) – MAI
Russian Federation
Cand. Sci. (Tech.), associate prof., Department of materials science


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Review

For citations:


Ivanov D.A., Shlyapin S.D., Valyano G.E., Fedorova L.V. FEATURES OF ALUMINUM POWDER PAP-2 GRANULATION IN THE TECHNOLOGY OF Al–Al2O3 POWDER COMPOSITE WITH LAYERED STRUCTURE. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2017;(4):37-43. (In Russ.) https://doi.org/10.17073/1997-308X-2017-4-37-43

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ISSN 1997-308X (Print)
ISSN 2412-8767 (Online)